Calendar of Physics Talks Vienna

Shall we go for a quantum walk? Divide et impera in quantum world - mastering the complexity and the uncomputable.

Speaker:

Magdalena Stobinska (University of Gdanks, Poland)

Abstract:

Quantum world reveals fascinating phenomena which are small wonders for the scientists working at the foundations of science and which, although usually abstract, carry potential for the future technologies. Recent research shows that they easily become intractable for computers and the situation would not change even if we had a quantum machine. How to describe these effects efficiently to master them? Divide et impera - divide the complex evolution into many simple steps, and observe the evolving system while repeating them. In this way, quantum walks provide simple models of various fundamental and complex processes in nature ranging from chaos, topological phases or photosynthesis to universal quantum computation, quantum search algorithms and boson sampling.
This lecture will provide an introduction to quantum walks and will explore their potential in describing important quantum

im Rahmen des GAP-Seminars: While the singularities theorems of Penrose and Hawking show the existence of singularities under
quite general assumptions they do not give any information about their structure. The BKL conjecture is an att -
empt to give a detailed description of generic spacelike singularities. It is unproven but supported by numerical
evidence and simplified models. I will describe the Hamiltonian Billiards formulation of the conjecture and give
some heuristic arguments in it its favor. Finally, I will present a rigorous result in the simplified "non-chaotic"
case.

This talk contains two parts. Firstly I will discuss some recent developments of higher spin theories in the context of AdS_3/CFT_2 correspondence, with special emphasis on the relation to String theory. The second part of the talk will be devoted to the Schroedinger type of solutions of the Vasiliev higher spin theory in D>3 dimensions.